trigger InstrumentDeliverApplicationTrigger on InstrumentDeliveryApplication__c(after update,after insert,after delete) {
    
    if( Trigger.isAfter && (Trigger.isUpdate || Trigger.isInsert|| Trigger.isDelete )) InstrumentDeliveryApplicationHandler.calcEquipmentNum(trigger.isDelete ? trigger.old :  trigger.new,trigger.isDelete );


}